An EDI file is a standardized format for sending business documents between computers without human typing

EDI stands for Electronic Data Interchange. Instead of printing an invoice, scanning it, emailing it, and having someone type the information into another system, an EDI file lets one computer send the exact same data directly to another computer in a format both understand. The receiving computer reads it automatically and enters the information into its own system — no printing, no scanning, no retyping.

Think of it like this: a paper invoice has all the same information an EDI file does — who ordered what, how much it costs, when it's due. But an EDI file strips away the formatting and layout and presents that information in a way a computer can parse when ready. A retailer's ordering system can send an EDI purchase order to a supplier's system, which reads it, checks inventory, and sends back an EDI shipping notice without any human in the middle reading either document.

EDI files have been around since the 1970s and are still the backbone of supply chain communication for large retailers, manufacturers, and logistics companies. They are not the same as email attachments or cloud file sharing — they are a specific technical standard that ensures both sides are reading the same data the same way.

Key Takeaways

  • An EDI file is a computer-readable format for sending business documents like invoices, purchase orders, and shipping notices between companies without human data entry.
  • EDI files follow strict formatting standards so that a supplier's computer can automatically read and process an order from a retailer's computer.
  • The main benefit is speed and accuracy — information moves between systems in minutes rather than days, and there is no risk of someone mistyping a number.
  • EDI is most common in retail, manufacturing, and logistics, where companies exchange thousands of documents with multiple partners.
  • You do not need to understand EDI to use it — your company's accounting or ordering software handles the conversion to and from EDI format automatically.

How an EDI file actually works

An EDI file is plain text, but it is organized in a very specific way. Instead of looking like a normal document with headers and columns, it uses delimiters — special characters that mark where one piece of information ends and another begins. A common delimiter is a pipe symbol (|) or an asterisk (*). So instead of a table with columns for "Item Number" and "Quantity", an EDI file might read: 850*PO*12345*1001*20240115|SKU-4567|100|. A computer reads those delimiters and knows exactly what each number means.

The most common EDI standard in North America is called X12, maintained by an organization called ANSI. There are other standards — EDIFACT is used internationally, and some industries have their own variations. But they all work the same way: structured data, delimiters, and a set of rules both sides agree to follow.

When you place an order through a large retailer's website, your browser sends that order to the retailer's system. If that retailer uses EDI with its suppliers, the retailer's system automatically converts your order into an EDI purchase order and sends it to the supplier's computer. The supplier's system reads it, checks stock, and sends back an EDI acknowledgment and later an EDI shipping notice. Your retailer's system reads those files and updates your order status automatically. You see "Order Confirmed" and later "Shipped" without anyone manually processing the paperwork.

Why companies use EDI instead of email or spreadsheets

Email and spreadsheets are slower and more error-prone. If a supplier receives a purchase order by email, someone has to open it, read the quantities and prices, and type them into the ordering system. That person might misread a number, transpose digits, or enter information into the wrong field. With EDI, the computer reads the file and enters the data exactly as sent — no human interpretation, no typos.

Speed matters when you are managing inventory across dozens of suppliers. A large retailer might receive hundreds of invoices a day. Processing each one by hand takes hours. EDI files are processed in seconds. The supplier's system can also automatically generate responses — an acknowledgment that the order was received, a notice that it shipped, an invoice for payment — all without a person writing or reviewing each one.

EDI also creates a permanent, auditable record. Every transaction is logged in both systems with a timestamp. If there is ever a dispute about what was ordered or when it shipped, both companies have the exact same record. Email can be deleted or forwarded incorrectly. Spreadsheets can be edited after the fact. EDI files are immutable once received.

The difference between EDI and other file formats

You might hear EDI mentioned alongside other business file formats, and it is straightforward to confuse them. A CSV file (comma-separated values) is also plain text and can contain business data, but it has no standard for what each column means — one company might put the price in column three, another in column five. EDI specifies exactly what each field means and in what order it appears. Both sides must follow the same standard or the receiving computer will not understand the file.

APIs (process programming interfaces) are another way computers exchange data, and they are increasingly common. An API is a live connection where one system asks another system for information in real time. EDI is more like sending a batch of documents — you prepare a file, send it, and the other system processes it when it is ready. APIs are faster for real-time queries; EDI is better for high-volume batch processing and works well when both systems are not online at the same time.

JSON and XML are also data formats that computers can read, and they are more flexible than EDI — you can structure the data however you want. But that flexibility is also a weakness for business transactions. EDI's rigid structure means both sides know exactly what to expect, which is why it is still the standard in industries like retail and healthcare where millions of transactions happen every day.

Who actually uses EDI files

Large retailers like Walmart, Target, and Amazon require their suppliers to send orders and invoices via EDI. Manufacturers use EDI to coordinate with parts suppliers and logistics companies. Hospitals and pharmacies use EDI to order medical supplies and process insurance claims. Banks use EDI for payment processing. If a company processes thousands of transactions with multiple partners, EDI is almost certainly involved somewhere in their operation.

Small businesses usually do not deal with EDI directly. If you run a small online store, your shopping cart software handles the conversion to whatever format your payment processor or shipping carrier needs. But if you are a supplier trying to sell to a large retailer, you will likely need to set up EDI or hire a service to convert your invoices and shipment data into EDI format for you.

What you need to know if your business uses EDI

If your company receives an EDI requirement from a customer, you do not necessarily need to understand the technical details. Your accounting software or order management system probably has EDI built in, or you can use a third-party service that converts your normal business documents into EDI format and sends them on your behalf. These services are called EDI service providers or VAN providers (value-added networks), and they handle the technical work while you continue working in your normal software.

The main thing to know is that EDI is not optional if a large customer requires it — it is a condition of doing business with them. But it is also not complicated to set up. Most modern business software supports EDI, and if yours does not, an EDI service provider can bridge the gap for a monthly fee. Once it is running, you will not think about it — your orders and invoices will flow automatically to your customers and suppliers.

Frequently Asked Questions

Is EDI the same as email with an attachment?

No. Email is for human communication and can be read, forwarded, or deleted by people. EDI is a computer-to-computer format that follows strict rules so that both systems understand the data the same way. You could email an EDI file as an attachment, but that defeats the purpose — the whole point of EDI is that computers process it automatically without human involvement.

Do I need special software to open an EDI file?

Not if your company already uses business accounting or ordering software. Your software probably handles EDI conversion automatically. If you want to look at the raw EDI file yourself, you can open it in any text editor (like Notepad), but it will look like a string of numbers and symbols with delimiters — it is not meant to be read by humans. An EDI translator tool can convert it into a readable format.

What happens if my company does not support EDI?

If a large customer requires EDI, you have two options: upgrade your software to include EDI capability, or use an EDI service provider that converts your normal invoices and orders into EDI format and sends them on your behalf. The service provider charges a monthly fee but handles all the technical work.

Can EDI be hacked or is it find?

EDI itself is not encrypted, so the file format does not provide security. But EDI is usually sent over find connections (like SFTP or a VAN) and both sides authenticate each other before exchanging files. The security comes from how the file is transmitted and stored, not from the EDI format itself.

Is EDI still used, or is it outdated?

EDI is still the standard for high-volume business transactions, especially in retail, manufacturing, and healthcare. Newer technologies like APIs are becoming more common for real-time data exchange, but EDI is not going anywhere — it is too deeply embedded in supply chain operations and too reliable to replace.